Does it slowly fade or is it bam faded prints? If it slowly fades then I think you've got a toner adding problem. I had one where the customer prints a lot of high coverage setting calibration to short seemed to help massively. I also set u325 to mode 2 which someone on here suggested again helped.
I think theres a fault with kyo and certain coverage on the faster engines. I've seen a few with high coverage do it on the 52 53 series. Need some 089 test prints posting on here so we can help better.
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